RPC Communication Error: VarType 8192 is not supported when using blackbox licenses to retrieve get_magnetic_graph() data

[EmilCallerfjord]

🔍 Before submitting the issue

• I have searched among the existing issues
• I am using a Python virtual environment

🐞 Description of the bug

Hello,

I am using the blackbox licenses for parametric sweep in MotorCAD through the pymotorcad API. I am getting the error "RPC Communication Error: VarType 8192 is not supported" when trying to get graph data through the function get_magnetic_graph().

When I am not using the multiprocessing package but still using a blackbox, I do not recieve this error and the data is retrieved without any errors.

📝 Steps to reproduce

1. Follow the "Running_Parallel_Sessions_Scripting" Python_Tutorial2
2. Add get_magnetic_graph("PhaseCurrent1") or any other magnetic graph.

💻 Which operating system are you using?

Windows

📀 Which ANSYS version are you using?

MotorCad 2024R2.3

🐍 Which Python version are you using?

3.10

📦 Installed packages

aiohappyeyeballs==2.4.3
aiohttp==3.10.10
aiosignal==1.3.1
annotated-types==0.7.0
ansys-motorcad-core==0.5.0
ansys-pythonnet==3.1.0rc3
appdirs==1.4.4
async-timeout==4.0.3
attrs==24.2.0
bezier==2023.7.28
biopython==1.79
certifi==2024.6.2
cffi==1.17.1
charset-normalizer==3.3.2
clr-loader==0.2.6
contourpy==1.2.1
cycler==0.12.1
defusedxml==0.7.1
et-xmlfile==1.1.0
fonttools==4.53.0
fpdf2==2.7.9
frozenlist==1.4.1
gtfparse==2.0.1
idna==3.7
importlib_metadata==7.1.0
jsonschema==4.23.0
jsonschema-specifications==2023.12.1
kiwisolver==1.4.5
matplotlib==3.9.0
multidict==6.1.0
numpy==1.26.4
openpyxl==3.1.5
packaging==24.1
pandas==2.2.2
pillow==10.3.0
plumbum==1.8.3
polars==0.16.18
propcache==0.2.0
psutil==5.9.8
pyaedt==0.10.2
pyarrow==16.1.0
pycparser==2.22
pydantic==2.9.2
pydantic_core==2.23.4
pyedb==0.28.0
pyfaidx==0.8.1.1
pyparsing==3.1.2
pypxl==0.2.3
pypxlib==2.5
python-dateutil==2.9.0.post0
pytomlpp==1.0.13
pytz==2024.1
pyvariant==2.2.4
pywin32==306
PyYAML==6.0.2
referencing==0.35.1
requests==2.32.3
rpds-py==0.20.0
rpyc==6.0.1
Rtree==1.3.0
scikit-rf==1.3.0
scipy==1.14.0rc2
scipyx==0.0.18
six==1.16.0
toml==0.10.2
typing_extensions==4.12.2
tzdata==2024.1
urllib3==2.2.1
yarl==1.16.0
zipp==3.19.2

[jgsdavies]

Hi @EmilCallerfjord. Is this maybe a problem with the script trying to access results too early? Do you have a minimal reproducible example I can use to test this locally?